基于流变理论的大水灰比深搅桩复合地基沉降预测

Settlement Prediction for High Water Cement Ratio of Deep Mixing Pile Composite Subgrade Based on Rheological Theory

由于岩土材料变形随时间呈现蠕变的特点,基于深搅桩复合地基工程地质复杂、地基检测要求严格,对此需对水灰比较大的实际工程状况进行分析。该文通过现场试验实测数据的分析,运用二维流变理论对深搅桩复合地基沉降进行拟合并预测未来沉降。预测结果显示25a时,地下通道结构上方滑行道面沉降大约在9.6cm,各点间的不协调变形变坡率都控制在1.5‰以内,地基处理可以满足机场滑行道对沉降的要求;同时也说明所选的二维流变理论具有良好的实际运用性。

For the characteristics of geotechnical material creep with the time, based on the practical engineering state of the complicated composite subgrade engineering geology of deep mixing pile, the strict inspecting test requirement of subgrade and the higher water cement ratio, the article analyzes the field measured data, and fits up the settlement of deep mixing pile composite subgrade and predicates the future settlement by two-dimensional rheological theory. The predicating result shows that the settlement of the taxiway surface at the upper structure of underground routeway is about 9.6 cm when 25a displays, and the altering gradient of the uncoordinated deformation is under control of 1.5‰. The subgrade treatment can meet the requirements of settlement for the airport taxiway, and at the same time, the selected two-dimensional rheological theory has a good practical use.